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Lionsele ® U3 for pistons<br />
Piston seals<br />
Lionsele ® U3<br />
Single-acting piston seal<br />
Description<br />
Lionsele ® U3 is a U-profiled seal of<br />
high-performance polyurethane,<br />
designed for single-action use on<br />
hydraulic pistons. Two of these<br />
seals, installed in a back-to-back<br />
arrangement, can be used on doubleacting<br />
pistons.<br />
The lip profile of this seal is designed as<br />
an interference fit within the housing. The<br />
radial squeeze provided by this action<br />
gives efficient sealing at low pressures.<br />
In operation, the seal becomes pressureresponsive<br />
to maintain sealing forces —<br />
even at very high pressures.<br />
In addition, the asymmetric profile of the<br />
sealing lips reduces float of the seal in<br />
the housing. This improves efficiency and<br />
reduces the pumping of fluid under the<br />
sealing lip.<br />
Special features<br />
• High mechanical strength polyurethane<br />
provides excellent extrusion and wear<br />
resistance to minimise plant downtime.<br />
• Improved sealing performance across<br />
the operational pressure range reduces<br />
power losses in the hydraulic cylinder.<br />
Typical applications<br />
Single-acting piston seal for hydraulic<br />
cylinders on general duty systems. For<br />
double-acting pistons, two separate seals<br />
can be used, but care must be taken to<br />
relieve any potential build up of internal<br />
pressure.<br />
Operating capabilities<br />
• Maximum operating pressure:<br />
42MPa (6092psi).<br />
• Temperature range:<br />
-30°C to +100°C (-22°F to +212°F).<br />
• Maximum surface speed:<br />
0.5m/s (98.4fpm).<br />
Materials of construction<br />
Precision moulded in wear-resistant<br />
polyurethane (AU/EU).<br />
Media capabilities<br />
Suitable for use with most mineral-based<br />
hydraulic fluids at temperatures up to<br />
100°C (212°F). Also resistant to air, and<br />
most lubricating oils and greases.<br />
Where fire-resistant fluids of the water/oil<br />
emulsion or water/glycol types are used,<br />
please contact our Technical Support<br />
Team for advice on temperature limits.<br />
How supplied<br />
(Also see <strong>Hydraulic</strong> sealing products —<br />
Size charts, which can be downloaded<br />
from www.jameswalker.biz)<br />
To suit BS ISO 5597 — Short (L1) and<br />
Medium (L2) axial length series, and BS<br />
ISO 6020-2 housings. Other sizes can be<br />
manufactured to order.<br />
Fitting instructions JAMES WALKER are supplied S.P.S. Ltd. with<br />
Marcoms Department<br />
every seal.<br />
Bi-directional<br />
pressure<br />
Lionsele ® U3 typical housings<br />
See Appendix E (page 58) for preferred<br />
housing designs, and Appendix W (pages<br />
79-82) for BS ISO 5597 — Short (L1) and<br />
Medium (L2) axial length series, and BS<br />
ISO 6020-2 housings.<br />
Single acting<br />
Direction<br />
of<br />
pressure<br />
Leaflet :<br />
<strong>Hydraulic</strong> <strong>Sealing</strong> Products<br />
Double acting<br />
Bearing housings<br />
Bearing housings<br />
Date :<br />
17/02/2010<br />
Sketch reference :<br />
Lionsele U3 006<br />
Lionsele U3 - Housed ; Piston sealing - Double acting<br />
34<br />
To order or for further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
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